Research

Gen-1 Open-Access Full-Duplex Radios in ORBIT

In order to support experimentation with full-duplex (FD) wireless, we integrated an open-access FD transceiver in the ORBIT wireless testbed. In particular, an ORBIT node (node11-10) with a National Instruments (NI)/Ettus Research Universal Software Radio Peripheral (USRP) N210 software-defined radio (SDR) was equipped with the Columbia FlexICoN Gen-1 customized RF self-interference (SI) canceller box. The RF canceller box includes an RF SI canceller that is implemented using discrete components on a printed circuit board (PCB) and achieves 40dB RF SI cancellation across 5MHz bandwidth.

The design and implementation of the FD transceiver and interfaces, and examples and guidelines for experimentation can be found in the technical report, the ORBIT instructions webpage, and the GitHub webpage. In particular, we provide an FD transceiver baseline program and present an example FD experiment, where 90dB overall SI cancellation is achieved across both the RF and digital domains, demonstrating the FD capability in the ORBIT testbed.